Changes between Version 160 and Version 161 of WiMAXInteg


Ignore:
Timestamp:
04/15/10 14:53:23 (11 years ago)
Author:
hmussman@bbn.com
Comment:

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  • WiMAXInteg

    v160 v161  
    316316=== 6.4  GPS Antenna ===
    317317
    318 Ivan:  Inclusion and choice of GPS antenna, for timing to base station  [[BR]]
    319 Candidate is [http://www.antenna.com/apg_products.cgi?id_num=11092  PCTel GPS-TMG-SP-40NGPS]  timing reference antenna, with integrated lightning protection  [[BR]]
    320 ISSUE:  Pick antenna with appropriate gain, and coax cable with appropriate attenuation.  [[BR]]
    321 
    322 
    323 
    324 The same antenna/mounting combo comes with 10, 20 and 40 dB of gain (the only issue is possible ringing with high gains so for cases where there is less than 50m of cable we should go with 10 or 20 dB max). I would definitely go for heavy duty mounting (like this one because it has built-in arrester so that all we need is a proper grounding which presumably already exist for the main antenna). As for what cable and where to get them, there are quite a few outfits; for example the site for WiMAX antenna:
    325 
    326   http://www.l-com.com/category.aspx?id=15
    327 
    328 Ivan.
    329 
    330 -----Original Message-----
    331 From: Harry Mussman [mailto:hmussman@bbn.com]
    332 Sent: Wednesday, March 31, 2010 11:37 AM
    333 To: 'michel,tony'; Ivan Seskar
    334 Cc: 'Harry Mussman'
    335 Subject: gps antenna and cable
    336 
    337 Tony and Ivan,
    338 
    339 I am updating the wiki, and am looking for:
    340 
    341 
    342 1)  gps antenna spec. 
    343 
    344 Per Ivan earlier, a good one is attached.
    345 
    346 Which mounting hardware?  Heavy duty?
    347 
    348 
    349 
    350 2)  gps antenna coax cable
    351 
    352 Assume:  up to 100m, like fiber?
    353 
    354 Overall loss budget:
    355 
    356         Output from antenna?
    357 
    358         Input range to NEC ODU?
    359 
    360         What coax, loss?
     318A GPS antenna assembly is provided, and connected to the IDU, to provide a stable and precise timing source to the base station.  The antenna assembly is connected to the IDU using a 50-ohm coax, that carries the receivedsignal to the IDU, and power to the antenna assembly.  [[BR]]
     319
     320The GPS antenna assembly can be mounted in any outdoor location where it can "see" the sky, but we will assume that it is mounted in the same location as the WiMAX antenna.
     321
     322
     323The suggested GPS antenna assembly is the [http://www.antenna.com/apg_products.cgi?id_num=11092  PCTel GPS-TMG-SPS-40NCB]  timing reference antenna.  It provides:
     324 * integrated lightning protection  [[BR]]
     325 * heavy duty mounting clamp
     326 * amplifier with 40 dB of gain
     327
     328The amplifier with 40 dB of gain compensates for loss in the 50-ohm coax cable run from the GPS antenna assembly at outside site, to the IDU at the indoor site.
     329
     330The suggested 50-ohm coax cable is [http://www.l-com.com/multimedia/diagrams/D_RG58C-_.JPG  RG58C/U], which has a loss at the GPS frequency of approxiamately 1000MHz of 40 dB for 200 ft of cable.
     331
     332Typical cable components:[[BR]]
     333 *  [http://www.l-com.com/productfamily.aspx?id=70  BNC-male to BNC-male cable], multiple lengths.[[BR]]
     334 *  [http://www.l-com.com/item.aspx?id=347  BNC-male to BNC-male cable], 200 ft length.[[BR]]
     335 *  [http://www.l-com.com/item.aspx?id=5261  BNC-female to BNC-female connector], to join two cables with N-male connectors.  [[BR]]
     336 *  [http://www.l-com.com/item.aspx?id=5261  BNC-female to N-male connector], to join a BNC-male cable to the GPS antenna assembly  [[BR]]
     337 
     338
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    368346
    369347
    370 Can we find a place that supplies cable with connectors?
     348
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